package pers.bc.utils.image;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;

import javax.imageio.ImageIO;

import pers.bc.utils.file.FileUtilbc;
import pers.bc.utils.pub.LoggerUtil;
import pers.bc.utils.pub.PubEnvUtil;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * 二维码工具类
 * @qualiFild pers.bc.utils.image.QRCodeUtil.java<br>
 * @author：licheng<br>
 * @date Created on 2020年4月3日<br>
 * @version 1.0<br>
 */
public class QRCodeUtilbc
{
    private static final String CHARSET = "utf-8";
    private static final String FORMAT = "JPG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int LOGO_WIDTH = 60;
    // LOGO高度
    private static final int LOGO_HEIGHT = 60;
    
    private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception
    {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        // hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (logoPath == null || "".equals(logoPath))
        {
            return image;
        }
        // 插入图片
        QRCodeUtilbc.insertImage(image, logoPath, needCompress);
        return image;
    }
    
    /**
     * 插入LOGO
     *
     * @param source 二维码图片
     * @param logoPath LOGO图片地址
     * @param needCompress 是否压缩
     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception
    {
        File file = new File(logoPath);
        if (!file.exists())
        {
            throw new Exception("logo file not found.");
        }
        Image src = ImageIO.read(new File(logoPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress)
        { // 压缩LOGO
            if (width > LOGO_WIDTH)
            {
                width = LOGO_WIDTH;
            }
            if (height > LOGO_HEIGHT)
            {
                height = LOGO_HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }
    
    public static String encodeStr(String content, String fileName) throws Exception
    {
        return encode(content, fileName).getPath();
    }
    
    public static File encode(String content, String fileName) throws Exception
    {
        BufferedImage image = QRCodeUtilbc.createImage(content, null, false);
        
        File file = new File(LoggerUtil.getFullFileName(fileName));
        ImageIO.write(image, FORMAT, file);
        
        return file;
    }
    
    /**
     * 生成二维码(内嵌LOGO) 二维码文件名随机，文件名可能会有重复
     *
     * @param content 内容
     * @param logoPath LOGO地址
     * @param destPath 存放目录
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static File encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception
    {
        BufferedImage image = QRCodeUtilbc.createImage(content, logoPath, needCompress);
        FileUtilbc.createFiles(destPath);
        if (PubEnvUtil.isEmpty(fileName)) fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();
        File file = new File(destPath + File.separator + fileName);
        ImageIO.write(image, FORMAT, file);
        
        return file;
    }
    
    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content 内容
     * @param logoPath LOGO地址
     * @param destPath 存储地址
     * @throws Exception
     */
    public static File encode(String content, String logoPath, String destPath, String fileName) throws Exception
    {
        return encode(content, logoPath, destPath, fileName, false);
    }
    
    /**
     * 生成二维码
     *
     * @param content 内容
     * @param destPath 存储地址
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static File encode(String content, String destPath, String fileName, boolean needCompress) throws Exception
    {
        return encode(content, null, destPath, fileName, needCompress);
    }
    
    /**
     * 生成二维码
     *
     * @param content 内容
     * @param destPath 存储地址
     * @throws Exception
     */
    public static File encode(String fileName, String content, String destPath) throws Exception
    {
        return encode(content, null, destPath, fileName, false);
    }
    
    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content 内容
     * @param logoPath LOGO地址
     * @param output 输出流
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static void encode(String content, String logoPath, OutputStream output, boolean needCompress) throws Exception
    {
        BufferedImage image = createImage(content, logoPath, needCompress);
        ImageIO.write(image, FORMAT, output);
    }
    
    /**
     * 生成二维码
     *
     * @param content 内容
     * @param output 输出流
     * @throws Exception
     */
    public static void encode(String content, OutputStream output) throws Exception
    {
        encode(content, null, output, false);
    }
    
    /**
     * 解析二维码
     *
     * @param file 二维码图片
     * @return
     * @throws Exception
     */
    public static String decode(File file) throws Exception
    {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null)
        {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }
    
    /**
     * 解析二维码
     *
     * @param path 二维码图片地址
     * @return
     * @throws Exception
     */
    public static String decode(String path) throws Exception
    {
        return decode(new File(path));
    }
    
    public static void main(String[] args) throws Exception
    {
        String text = "http://www.baidu.com";
        // 不含Logo
        // QRCodeUtil.encode(text, null, "e:\\", true);
        // 含Logo，不指定二维码图片名
        // QRCodeUtil.encode(text, "e:\\csdn.jpg", "e:\\", true);
        // 含Logo，指定二维码图片名
        QRCodeUtilbc.encode(text, null, "e:\\", "qrcode.png", true);
    }
}
